KR101409556B1 - Electric blower - Google Patents

Abstract

An electric blower according to the present invention comprises: an impeller; And a rotating part coupled to the impeller to drive the impeller, and a stationary part, wherein the rotating part includes a magnet, and the stationary part includes an armature made of a core and a coil positioned to face the magnet, And a driving module having an air bearing part between the rotating part and the fixed part, wherein the rotating part and the impeller are rotated by the electromagnetic force of the magnet and the armature, and the driving module is accommodated in the impeller.

Description

[0001] Electric blower [0001]

The present invention relates to an electric blower.

Generally, an electric blower for a vacuum cleaner uses a shaft system of a ball bearing, and a fan and a rotor are separated from a rotor and a bearing. Further, the impeller is assembled on the upper side of the rotor.

In the electric blower according to the related art including the following patent documents, the separate ball bearing module and the driving module of the impeller are combined to be mounted on the lower part of the impeller, so that the structure is complicated and the implementation of miniaturization And the stability of the motor can not be maintained when the motor rotates at a high speed.

US 20070134109A

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above problems, and it is a first aspect of the present invention to provide an electric blower in which friction between the plate of the impeller and the ball of the driving module, So that the impeller is rotated so as to be minimized.

According to a second aspect of the present invention, there is provided an electric blower capable of ultra-high speed driving as the friction is minimized according to the dynamic pressure design by the air bearing, and an ultra-small and light- .

An electric blower according to an embodiment of the present invention includes an impeller; And a rotating part coupled to the impeller to drive the impeller, and a stationary part, wherein the rotating part includes a magnet, and the stationary part includes an armature made of a core and a coil positioned to face the magnet, And a driving module having an air bearing part between the rotating part and the fixed part, wherein the rotating part and the impeller are rotated by the electromagnetic force of the magnet and the armature, and the driving module is accommodated in the impeller.

Further, in the electric blower according to an embodiment of the present invention, the rotary part of the driving module includes a sleeve rotatably supported by the shaft, and a hub coupled to the sleeve and coupled to the inner circumference of the magnet.

The hub of the electric blower according to an embodiment of the present invention further includes a disc portion coupled to the sleeve and extending radially outwardly of the shaft from the sleeve and a shaft portion extending radially outwardly of the shaft, And the magnet is mounted on the side wall portion.

Further, the sleeves and the shafts of the electric blower according to the embodiment of the present invention are mounted with magnets for magnetic bearings on the surfaces facing each other.

Further, the magnet for the magnetic bearing of the electric blower according to an embodiment of the present invention may be mounted on the upper end of the sleeve.

Further, the magnet for the magnetic bearing of the electric blower according to the embodiment of the present invention may be a ring-shaped.

The fixed part of the driving module of the electric blower according to an embodiment of the present invention includes a shaft for rotatably supporting the rotary part, a bead fixedly coupled to the shaft, Includes an armature.

In addition, the shaft of the electric blower according to an embodiment of the present invention is inserted into the sleeve so as to form an air bearing portion with a slight gap from the sleeve, and a dynamic pressure is generated on the outer circumferential surface of the shaft, which is opposed to the sleeve in the radial direction of the shaft Grooves are formed.

Further, the shaft of the electric blower according to an embodiment of the present invention includes a ball mounted on the opposed surface of the impeller with respect to the axial direction of the shaft.

Further, in the shaft of the electric blower according to the embodiment of the present invention, the ball receiving groove for mounting the ball is formed at the center of the upper surface of the shaft.

Further, the impeller of the electric blower according to an embodiment of the present invention further includes a plate mounted on an opposite surface of the ball.

Further, the electric blower according to an embodiment of the present invention further includes an impeller cover covering the impeller, and a motor housing coupled to the impeller cover to which the fixing portion is mounted.

An electric blower according to another embodiment of the present invention includes an impeller; And a rotating part coupled to the impeller to drive the impeller, and a stationary part, wherein the rotating part includes a magnet, and the stationary part includes an armature made of a core and a coil positioned to face the magnet, Wherein the rotating part and the impeller are rotated by the electromagnetic force of the magnet and the armature, the driving module is housed in the impeller, and the rotating part of the driving module is rotated by the shaft A sleeve rotatably supported by the sleeve and a magnet coupled to the sleeve to face the armature of the securement portion.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention, the impeller is rotated so that the friction is minimized as the plate of the impeller is point-contacted with the ball of the drive module at the time of initial driving, that is, before the impeller is lifted. According to the dynamic pressure design by the air bearing, The driving module can be housed in the impeller, so that it is possible to obtain an electric blower which can be realized in a very small size and light weight.

1 is a sectional view schematically showing an electric blower according to a first embodiment of the present invention;
Fig. 2 is a cross-sectional view schematically showing a drive module in the electric blower shown in Fig. 1. Fig.
3 is a cross-sectional view schematically showing a rotating portion of a driving module mounted on an impeller in the electric blower shown in Fig.
4 is a cross-sectional view schematically showing an electric blower according to a second embodiment of the present invention;
Fig. 5 is a cross-sectional view schematically showing a drive module in the electric blower shown in Fig. 4. Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. It is also to be understood that the terms "first,"" second, "" one side,"" other, "and the like are used to distinguish one element from another, no. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view schematically showing an electric blower according to a first embodiment of the present invention. As shown in the figure, the electric blower 100 includes an impeller 110 and a driving module 120. More specifically, the drive module 120 of the electric blower 100 is positioned below the impeller to be received within the impeller.

Further, the impeller 110 is covered by the impeller cover 200. The driving module 120 includes a rotating portion and a fixed portion. The rotating portion is coupled to the impeller 110, and the fixed portion is mounted to the motor housing 300. The cover 200 and the motor housing 300 are coupled by press fitting or the like.

Further, the drive module has a radial dynamic pressure bearing portion formed on the shaft so as to have an air bearing portion.

As described above, the electric blower according to the embodiment of the present invention has a structure in which the driving module is inserted into the impeller, so that the electric blower is miniaturized and lightweight, and can be driven at high speed by the air bearing.

Hereinafter, the driving module of the electric blower according to the present invention will be described in detail with reference to FIG.

Fig. 2 is a cross-sectional view schematically showing a drive module in the electric blower shown in Fig. 1. Fig. The driving module 120 includes a fixing part including a shaft 121, a base 122, an armature 123 composed of a core 123a and a coil 123b, and a printed circuit board 129, A sleeve 124 hub 125 and a magnet 126. The outer diameter portion of the shaft 121 and the inner diameter portion of the sleeve 124 have a minute gap, Is formed. Magnets 128 for the magnetic bearings are mounted on the opposite surfaces of the sleeve and the shaft, respectively.

The sleeve 124 is rotatably supported by the shaft 120. The sleeve 124 is supported on the shaft 121 at a small gap with the shaft 121 as described above, A radial dynamic pressure generating groove may be formed on the inner diameter portion so as to form a part.

The hub 125 includes a disc portion 125a coupled to the sleeve 124 and extending radially outwardly from the sleeve 124 and a disc portion 125a extending radially outward from the radial outer end of the disc portion 125a, And a side wall portion 125b extending downward in the axial direction.

The magnet 126 is mounted on the inner circumferential surface of the side wall 125b so as to face the armature 123 formed of the core 123a and the coil 123b.

The sleeve is mounted on the inner circumferential surface of the shaft so as to face the magnet 128b for the magnetic bearing of the shaft, and the magnet 128a for the magnetic bearing is mounted.

The magnet 128a for the magnetic bearing may be annular.

Next, in the fixing portion, the shaft 121 rotatably supports the sleeve 124 and the lower portion is fixedly coupled to the base 122 as described above.

The shaft 121 is opposed to the magnet 128a for the magnetic bearing of the sleeve, and the magnet 128b for the magnetic bearing is mounted. Further, the shaft may have a magnet accommodating portion 121c for a magnetic bearing for mounting the magnet for the magnetic bearing.

In other words, the magnetic bearing 128a and 128b mounted on the sleeve 124 and the shaft 121 can be designed as a drive module having a more stable system and a dynamic pressure design in addition to an air bearing.

The shaft 121 may be mounted with a ball 127 for point contact to reduce friction with the impeller 110 during initial operation. The shaft 121 is formed with a ball receiving groove 121b. The ball receiving groove 121b may be formed at the center of the upper surface of the shaft.

As shown in FIG. 1, the plate 111 may be mounted on the impeller 110 so as to face the ball 127.

A radial dynamic pressure generating groove 121a may be formed on the outer circumferential surface of the shaft 121 to form an air bearing portion. As described above, the dynamic pressure generating groove may be selectively formed on the outer circumferential surface of the shaft opposed to the sleeve or on the inner circumferential surface of the sleeve facing the shaft.

Figs. 1 and 2 show the dynamic pressure generating grooves formed on the outer circumferential surface of the shaft. According to the dynamic pressure design, the dynamic pressure generating grooves can be variously shaped and sized by a hair ring or the like.

Next, an armature 123 composed of a core 123a and a coil 123b is fixedly coupled to the outer periphery of the base 122 by press-fitting, adhesion, or the like so as to face the magnet 126. [

The printed circuit board 129 is mounted on one side of the base 122 for supplying power to the armature.

3 is a cross-sectional view schematically showing a rotating part of a driving module mounted on an impeller in the electric blower shown in Fig. As shown in the figure, the rotating part of the driving module 120 is mounted inside the impeller 110. Also, as described above, the impeller 110 is mounted on the plate 111 so as to face the ball 127 of the driving module.

Further, the sleeve 124 and the hub 125 on which the magnet 126 is mounted are coupled to the inside of the impeller.

As such, the impeller 110 is rotated at the same time as the rotating portion of the driving module rotates.

4 is a cross-sectional view schematically showing an electric blower according to a second embodiment of the present invention.

More specifically, the electric blower according to the second embodiment is implemented as an inner-rotor type in which the magnet is coupled to the sleeve and rotated together with the sleeve, as compared with the electric blower according to the first embodiment. As shown in the figure, the electric blower 100 includes an impeller 110 and a driving module 130. More specifically, the driving module 130 is mounted and received in the interior and the lower portion of the impeller 110 of the electric blower 100.

Further, the impeller 110 is covered by the impeller cover 200. The driving module 130 includes a rotating portion and a fixed portion. The rotating portion is coupled to the impeller 110, and the fixed portion is mounted to the motor housing 300. The cover 200 and the motor housing 300 are coupled by press fitting or the like.

Further, the drive module has a radial dynamic pressure bearing portion formed on the shaft so as to have an air bearing portion.

As described above, the electric blower according to the embodiment of the present invention has a structure in which the driving module is inserted into the impeller, so that the electric blower is miniaturized and lightweight, and can be driven at high speed by the air bearing.

Hereinafter, the driving module of the electric blower according to the second embodiment will be described in detail with reference to FIG.

5 is a cross-sectional view schematically showing a driving module in the electric blower shown in Fig. The driving module 130 includes a fixing unit 130 including a shaft 131, a base 132, an armature 133 composed of a core 133a and a coil 133b, and a printed circuit board 138, A sleeve 134 and a magnet 135. The outer diameter portion of the shaft 131 and the inner diameter portion of the sleeve 134 have a minute gap and an air bearing portion is formed at the minute gap. Further, magnets 137 for magnetic bearings are mounted on the opposite surfaces of the sleeve and the shaft, respectively.

More specifically, the sleeve 134 is rotatably supported by the shaft 131. The sleeve 134 is supported by an air bearing (not shown) at a small distance from the shaft 131, A radial dynamic pressure generating groove may be formed on the inner diameter portion so as to form a part.

Further, the sleeve is mounted on the inner circumferential surface thereof with a magnet 135 facing the armature of the stationary portion. A magnetic bearing magnet 137a is mounted so as to face the magnet 137b for the magnetic bearing of the shaft.

The magnet for magnetic bearing 137a may be annular.

Next, in the fixing part, the shaft 131 supports the sleeve 134 in a rotatable manner, and the lower part is fixedly coupled to the base 132 as described above.

The shaft 131 is opposed to the magnetic bearing magnet 137a of the sleeve, and the magnetic bearing magnet 137b is mounted.

That is, the magnetic bearing can be designed in addition to the air bearing by the magnets 137a and 137b mounted on the sleeve 134 and the shaft 131, respectively, and can be designed as a drive module having a more stable system.

The shaft 131 may be mounted with a ball 136 for point contact to reduce friction with the impeller 110 during initial operation.

As shown in FIG. 1, the plate 111 may be mounted on the impeller 110 so as to face the ball 127.

A radial dynamic pressure generating groove may be formed on the outer circumferential surface of the shaft 131 to form an air bearing portion. As described above, the dynamic pressure generating groove may be selectively formed on the outer circumferential surface of the shaft opposed to the sleeve or on the inner circumferential surface of the sleeve facing the shaft.

Next, an armature 133 composed of a core 133a and a coil 133b is fixedly coupled to the base 132 by press-fitting, adhesion, or the like so as to face the magnet 135. [

The printed circuit board 138 is mounted on one side of the base 132 for supplying power to the armature.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: electric blower 110: impeller
120: drive module 200: impeller cover
300: motor housing 121: shaft
121a: radial dynamic pressure generating groove 121b: ball receiving groove
121c: Magnet accommodating portion 122: Base
123a: core 123b: coil
123: armature 124: sleeve
125: hub 125a:
125b: side wall portion 126: magnet
128, 128a, 128b: Magnet for magnetic bearing 129: Printed circuit board
130: drive module 131: shaft
132: Base
133a: core 133b: coil
133: armature 134: sleeve
135: Magnet
137, 137a, 137b: Magnet for magnetic bearing 138: Printed circuit board

Claims (13)

Impeller; And
A rotating part coupled to the impeller to drive the impeller, and a fixed part, wherein the rotating part includes a magnet, a sleeve rotatably supported by the shaft, a hub coupled to the sleeve, And a driving module having an armature made of a core and a coil positioned to face the magnet and having an air bearing part between the rotating part and the fixed part,
Wherein the rotating portion and the impeller are rotated by the electromagnetic force of the magnet and the armature, and the driving module is accommodated in the impeller.
delete The method according to claim 1,
The hub
A disc portion coupled to the sleeve and extending radially outwardly of the shaft from the sleeve,
And a side wall portion extending downward in an axial direction of the shaft at a radially outer end of the disk portion, wherein the magnet is mounted to the side wall portion.
The method according to claim 1,
Wherein the sleeve and the shaft are mounted on the opposite surfaces with magnets for magnetic bearings, respectively.
The method of claim 4,
Wherein the magnet for the magnetic bearing is mounted on the upper end of the sleeve.
The method of claim 4,
Wherein the magnetic bearing magnet is formed in a ring-like shape.
delete The method according to claim 1,
The fixed portion of the drive module
A shaft for rotatably supporting the rotating portion,
A base fixedly coupled to the shaft,
And an armature coupled to the base and comprising a core and a coil.
The method of claim 8,
Wherein the shaft is inserted into the sleeve so as to form an air bearing portion, and a dynamic pressure generating groove is formed on the outer circumferential surface of the shaft facing the sleeve in a radial direction of the shaft.
The method of claim 9,
Wherein the shaft includes a ball mounted on an opposed surface of the impeller with respect to an axial direction of the shaft.
The method of claim 10,
Wherein the shaft has a ball receiving groove formed in a central portion of an upper end surface of the shaft for mounting the ball.
The method of claim 11,
Wherein the impeller further comprises a plate mounted on an opposite surface of the ball.
The method according to claim 1,
An impeller cover covering the impeller; And
And a motor housing coupled to the impeller cover to which the fixing portion is mounted.

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